Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f3948287ff2653…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 23:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03fa4799985435800473d1a820d7e7a1 SHA-1: dcc4d347cb0d8f398d04446f0b54f4e2a8c12971 SHA-256: 55f3948287ff26530227e8b9db98bee323036a5d7afae155dd4d7dc1487d2df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/75bde33f3bf744d1715725d580b2ddb5/12718999943.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f9258c021100485c3f6abff6a17ceb62/8109173370.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17378926471.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/69506715160.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4aeeac96788663b322e98d4b12c3e0b0/31635479099.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160983e489788c---guwixamen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607376239f455---89197987698.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3cp8oaj5s7r5qb32bo8djfspm9/fawibafukosikej.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2ug014fln6ae0b0786ru3vksg5/borawolojubaxobokowabosos.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa985092fdc---pudosuwonuvolizoturi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/fubatoku.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa178dca06b---miwazademaxedufuresun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c27da000c---51762406892.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/burolufiji.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/kumudaregosomixobudolib.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/79988636329.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8ada6d18---nubifisabokaxitoja.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be3623745ae---baxeremopuxudomalus.pdfIn PDF document text
    • http://accronline.com/userfiles/file/xotubegu.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/5904495586.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/98359171669.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/31122360469.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0a89a015b---32094758415.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7748012af2952db73fa05432aa65e14f/xotujat.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f30b04c1d932797c19fc3506551226b8/84183576953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=corporate+finance+mergers+and+acquisitionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17348 bytes
SHA-256: edf03b76dbb738562e6b0ff24752428af8584ded4a27b0fe4b53cc632abbc4ba
font_02_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 11192 bytes
SHA-256: 11cf41f74606fb52a49809345326357159f59c12a3eeac5a4a3f61a7eb6dd01b

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